public class Example12_1 {
    public static void main(String args[]) {
        SpeakElephant speakElephant;
        SpeakCar speakCar;
        speakElephant = new SpeakElephant();
        speakCar = new SpeakCar();
        speakElephant.start();
        speakCar.start();
        for (int i = 1; i <= 15; i++) {
            System.out.print("主人" + i + "  ");
        }
    }
}
